{
  "manageEntity": {
    "action": "Save",
    "entityId": "456250",
    "entityType": "Track",
    "nonce": "0x763215d0e954c4cf90b66a7b7f47564fc16266d0a85d4bf4c2376572232942cc",
    "signature": "0x0e46ada77f61c81cf7e3bc4446539d09085e6ce488c9a5e6119634be8517a9634d8beb0740d6d964ba541506d5ad33c3de2e391efc6571f5c317ce56866506831b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}